Dredge pin and joint.



PATENTED FEB. 19, 1907.

L. P. MARTIN.

DRBDGE PIN AND JOINT.

V5 INVENTOR E E I) m APPLICATION FILED JUNE 28. 1905.

WITNESSES:

ATTORNET.

' void of projecting locks and "UNITED STATES PATENT (ll-Fill LUDOLPH P.MARTIN, OF MILWAUKEE, WISCONSIN, ASSTGNOR TO ALLTS? CHALMERS COMPANY, orMILWAUKEE,

OF NEW JERSEY.

' Application filed June 28,

To all whom it may concern.-

Be it known that I, Lun'oLrn P. MARTIN, a citizen of the United States,residing at h'lilwaukee, in the county of Milwaukee and State ofWisconsin, have invented certain new and useful Improvements in DredgePins and Joints, of which the following is a specification.

This invention relates to a flexible jointbetween adjacent links of a(hed, ,e-chain, and especially to such. a means where the link-pin isfree to turn and yet is prevented from'end displacement. I

The object of the invention is to produce a connection which is simple,efficient, and doother means, and yet which is readily assembled ordiscon' nected.

In the drawings, Figure l is a sectional view on the center line of thelink-pin of the joint between two adjacent links fragmentarily shown.Fig. 2 is a side elevation, partly in sectioh on line 2 2, Fig. l, oftwo links and two joints. v

The chain is composed of links, which, shown, may be alternately plainlinks and bucket-links 30, or the links may be all of one kind. As theinvention is illustrated in connection with a dredgeehain, thebucketlinks are shown and for convenience alternating with plain links20.

I The links have eyes 21 3] The eyes ,rve cored perfora ions inalinement and of noncircular shape. In the drawings they are shown ascircular with a portion of their walls flattened to a plane l rfaee.Into these perforations are loosely htted bushings 22 32 of an eXternalconfiguration like that of steel link-pin 40,

.ectangular section, near the perforations in the eyes, except slightlysmaller. These bushings are of tough and hard material, preferablymanganese-steel.

The bushings 22 32 are cylindrical within, and when the links 20 30arein proper relative position the eyes 21 31 are in alinelnent, so that acontinuous cylindrical chamber is formed by the series of bushings.

Vl ithin the bushings 22 32 is passed a and its extremities are flushwith the outer surface of each outside eye 21, as shown. The pin isprovided with annular grooves 41 41, preferably of its extremities andSpecification of Letters Patent.

WTSCONSIN, A CORPORATION DREDGE PEN AND dCrlhlT.

Patented. Feb. 19.1907;

1905. Serial No. 267,382.

l the cylindrical space within them,

preferably opposite the center of the outside eyes 21.

A hole, preferably rectangular, is formed in the outside eyes 21 of thelinks 20 in the central plane of the eyes transverse to the link-pinaxis. This hole so located as to intercept both the outside bushings 22and The hole is of the same width as the grooves 41 in linkpin -10. Pins4-2 are driven into these holes and rivetedat both ends firmly inoutside eyes These pins serve to lock the linkpin 10 from enddisplacement, although permitting the link-pin to rotate freely. Therebeing two such loeking pins 42 and their location being in the end eyes21, they also serve to lock the bushings 22 I32 fTOli'l enddisplacement. The bushings are prevented from turning by theirnon-circular outer configuration, and their location in similarlyshapedperforations in the eyes of the links.

'l he locking-pins l2 are shown of rectangular configuration, so as toprevent oven the slightest endwise displacement of the linkpin 40 evenafter considerable circumferential wear; but the pins 42 may be roundwith nearly as efficient-action.

In the drawings the clearance has been shown exaggerated forconvenience.

It is to be understood that it is not desired to be limited to the exactdetails of construction shown and described, for obvious modificationswill occur to person skilled in the art.

i v hat is claimed isi. A pair of links, grooved pin free to turn in.each link, and means coacting with the groove to prevent enddisplacement oi the pin.

2. in a chain, adjacent links, a link-pin free to turn in each link andpivotally connecting the links, there being a groove in the linl' pinadjacent an end thereof, and means coacting with the groove forpreventing end rtlisplscemcnt of the link pin.

A pair of links having a plurality of spaced alined eyes, a link-pin inthe eyes and free to turn in each link, and means in an outside cye forlocking the pin. against end displacement.

4. In chain, adjacent links, a link-pin pivotally connecting the links,bushings be tending into a link, a bushing and the groove for preventingend displacement of the bushing and link-pin.

5. In a chain, adjacent links, there being eyes on the links, a bushinginv each eye, a

pivotally connecting the links, there being an annular groove in thelink-pinadjacent both ends, and means extending into the outi slde eyes,the outside bushings and the 1 4 grooves for preventing end displacementof the bushings and link-pin.

6. In a chain, adjacent links, there being eyes onthc links, a bushingin each eye keyed from rotation by external non-circular coning thelinks, there being a groove in the link- 20 pin adj aeent' both ends,and means extending into the outside eyes, the outside bushings link-pinextending through the bushings and and the grooves for preventing enddisplacement of the bushings and link-pin.

In testimony whereof I allix my signature 25 in presence of twowitnesses.

LUDOLPH P. MARTIN. V Witnesses:

W. N. TANNER, J HN Dug-Jr.

